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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Inventory [Line Items]    
Raw material $ 819  
Work-in-process 8,142  
Finished goods 33,784  
Supplies 1,431  
Total inventories $ 44,176  
Predecessor    
Inventory [Line Items]    
Raw material   $ 879
Work-in-process   6,093
Finished goods   3,689
Supplies   1,532
Total inventories   $ 12,193